Updated mediawiki/skins
Project: mediawiki/skins/BlueSky  796fe93210c780abc18741e786a4954bba7711b8

* Removed wikiHow-specific ad-related code
* Removed some commented-out code
* Fixed one URL
* Small HTML validation fix -- all <img>s need an alt attribute, even if it's empty

Change-Id: I6ed52f00bdc504faf00aae25e224a2d4736316a6